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Theory of Machine

Theory of Machine
Elements of pairs held together mechanically is known as

Closed pair
Rolling pair
Open pair
Mechanical pair

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Theory of Machine
When the speed of the engine fluctuates continuously above and below the mean speed, the governor is said to be

Stable
Isochronous
Unstable
Hunt

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Theory of Machine
A friction circle is a circle drawn when a journal rotates in a bearing. Its radius depends upon the coefficient of friction and the

Clearance between journal and bearing
Angular velocity of journal
Magnitude of the forces on journal
Radius of journal

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Theory of Machine
Minimum number of teeth for involute rack and pinion arrangement for pressure angle of 20° is

34
30
20
10

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Theory of Machine
The maximum value of the pressure angle in case of cam is kept as

30°
20°
10°
14°

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Theory of Machine
The sense of Coriolis component is such that it

Leads the sliding velocity vector by 90°
Lags the sliding velocity vector by 90°
Leads the sliding velocity vector by 180°
Is along the sliding velocity vector

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